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Update policy-csp-dmaguard.md

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Added link to DMA Remapping guidance
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Aacer Daken 2020-06-08 15:45:29 -07:00 committed by GitHub
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windows/client-management/mdm/policy-csp-dmaguard.md
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@ -73,7 +73,7 @@ manager: dansimp
<!--/Scope-->
<!--Description-->
This policy is intended to provide additional security against external DMA capable devices. It allows for more control over the enumeration of external DMA capable devices incompatible with DMA Remapping/device memory isolation and sandboxing.
This policy is intended to provide additional security against external DMA capable devices. It allows for more control over the enumeration of external DMA capable devices incompatible with [DMA Remapping](https://docs.microsoft.com/windows-hardware/drivers/pci/enabling-dma-remapping-for-device-drivers)/device memory isolation and sandboxing.
Device memory sandboxing allows the OS to leverage the I/O Memory Management Unit (IOMMU) of a device to block unallowed I/O, or memory access, by the peripheral. In other words, the OS assigns a certain memory range to the peripheral. If the peripheral attempts to read/write to memory outside of the assigned range, the OS blocks it.